ついで

ついで

"Opportunity" or "while doing something else; on the occasion."

In this sentence, "ついで" implies taking advantage of the main trip to Tokyo to also visit a museum.

東京に行くついでにあの美術館を訪れたい。

I want to visit that museum while going to Tokyo.

Here, "ついで" indicates that taking pictures was an additional action accompanying the walk.

散歩のついでに写真を撮りました。

I took pictures while taking a walk.

Here, "ついで" refers to doing something as a secondary action while primarily undertaking another action.

買い物に行くついでに郵便局に寄りました。

I stopped by the post office on the way to shopping.